View Compilation Error

0_0_34215628_18992.cpp: In function 'int main()':
0_0_34215628_18992.cpp:12:3: error: 'ksiwchen' was not declared in this scope
   ksiwchen=skab.size();
   ^
0_0_34215628_18992.cpp:15:82: error: 's' was not declared in this scope
     if( ( (skab[j]=='2'||skab[j]=='3'||skab[j]=='5'||skab[j]=='6'||skab[j]=='8'||s[j]=='9')&&(i==1||i==h||i==(h+1)/2) )|| ( s[j]=='4'&&i==(h+1)/2 ) || ( s[j]=='7'&&i==1 ) || ( s[j]=='0'&&(i==1||i==h) ) )
                                                                                  ^